Send SOAP messages to a service from DevUI

[ppalaga]

Originally requested by @Inithron in #1015 (comment):

I have also an idea to improve the DevUI: The Kafka Client provides the possibility to send a message into a Kafka topic and the OpenAPI extension to send a message via the SwaggerUI to a REST service. It would be great if the CXF extension would provide something similar, to send a SOAP message to the SOAP service.
And as an additional feature it would be great if the extension could create message templates based on the WSDL.
And as a second additional feature it would be great if the extension would support the WS-Security features like encrypting or signing a message before it is send.